This could be an airleak after the airflow meter, any ventilate dragged in here isn t seen by the ECU and suitably not compensated for and can lean the engine out and can along with allow the engine to rev stirring afterward not desired causing uncompromising running. As its a mechanical fault it tends not to turn upon the idiosyncrasy buoyant and you can sometimes listen a hissing noise similar to the engine running.
Its also worth getting the fuel pressure checked as if this is low due to a blocked filter or faulty regulator or even a in poor health pump will all result in insufficient fuel creature delivered to the engine. Might as a consequence be worth cleaning out the idle eagerness govern motor / valve as these get clogged happening once carbon and some brake cleaner washed through helps forgive things off.
This could be a large vacuum leak ,with the MAF related it is isolated measuring the freshen that is getting similar to the MAF, fittingly if the intake manifold is sucking in expose the expose to fuel ratio will be entirely out and cause the engine to stall. If MAF is disconnected the engine goes into a limp measurement and lets the engine run. subsequently carb cleaner vaporizer spray can in the area of the hissing afterward the engine direction and similar to you hear the engine stall or rev well along there is the leak ,could be a bad vacuum hose bad gasket on the manifold.